"Now skipping millions of years on the evolutionary scale, I see this soft/hard duality as the beginning of two sexes as well. Contrary to common perceptions, it is the female that is hard and the male that is soft. In simple undeniable terms it is woman that enables embryonic development within her own body--women's bodies themselves are protective shells (only women corporeally possess and facilitate the human egg that in turn allows fetal development). Men, on the other hand, very much do not have a "built-in" protectiveness, hence men make great displays about forever being on the defensive, and indeed it is almost exclusively men that have continually created our planet's foremost industry, if only to create that protective shell that their sex was not born with--the age old military apparatus (shields, armor, war ships, submarines, tanks, stealth bombers, etc. are all "man"-made protective shells)."